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          Kubernetes环境中上传附件慢的问题解决
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        <p>最近项目中有一个上传文件的功能，文件大小基本在100M以上，在使用过程中发现在有时候上传特别慢，内网环境上传100m的附件需要几分钟，但有时候却需要10几秒。</p>
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<p>环境情况：</p>
<ul>
<li>系统环境是部署在公司内网Kubernetes的集群中</li>
<li>通过内网域名访问Kubernetes集群，前端使用Ingress进行反射代理</li>
</ul>
<p>经过N次的验证，最终得出来的结果：</p>
<p>内网域名解析的地址与Pods所在的Node 是同一台机器，速度很快，如果不是一台机器速度就很慢。这也证明的不是程序的问题，应该从部署层面，重点是网络层面查找问题。</p>
<ul>
<li>验证过程中排除了集群Node节点间的网络问题，节点间传输速度正常</li>
<li>iptables 规则的数量在可以接受范围内，不会导致性能下降太多</li>
</ul>
<p>查看Kubernetes kube-proxy 组件的日志时发现一条Waring Can`t enable XDP acceleration. error=kernel is too old (have: 3.10.0 but want at least: 4.16.0)</p>
<p>发现一个警告，意思是XDP功能无法开启，内核版本过低，将Master 与Node 节点的内核都升级到5.8版本。启动集群没有Waring 信息出现。验证上传功能，所有节点正常！</p>
<p>参考资料：<br><a target="_blank" rel="noopener" href="https://www.iovisor.org/technology/xdp">xdp</a></p>

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